Let's Encrypt ACME-v01 Connection Failed (Deprecated)

SSL & HTTPS | Updated March 2026
Outdated Article

This article references the Let's Encrypt ACMEv1 API endpoint (acme-v01.api.letsencrypt.org), which was permanently shut down in June 2021. All certificate issuance now uses the ACMEv2 endpoint. If you're having trouble with Let's Encrypt SSL certificates on your Ultra Web Hosting account, the issue is no longer related to this endpoint.

cPanel's AutoSSL handles Let's Encrypt certificate issuance automatically using the current API. If your free SSL certificate isn't renewing or issuing, see our updated guide:

SSL Certificates and HTTPS on Your Website

  • 6 Users Found This Useful

Was this answer helpful?

Related Articles

How to Fix Mixed Content Warnings After Enabling SSL

SSL & HTTPS | Updated March 2026 Mixed content warnings happen when your website loads...

How can I redirect http to https?

SSL & HTTPS | Updated 2026 After installing an SSL certificate on your site, you need to...

This webpage is not available ERR_SSL_VERSION_OR_CIPHER_MISMATCH

SSL & HTTPS | Updated March 2026 The ERR_SSL_VERSION_OR_CIPHER_MISMATCH error means your...

Installing an SSL Certificate in cPanel

SSL & HTTPS | Updated 2026 Ultra Web Hosting includes free Let's Encrypt SSL certificates...



Save 30% on web hosting - Use coupon code Hosting30